Copyright, what is the guideline?

Ok, this has been puzzled me for some time.
We all heard about very strict copyright violation cases over internet.
However, whenever I use Youtube, I am seeing literally hundreds thousand of full record streaming and full movie streaming.
Film and record industry are armed with capable lawyers and yet tons of people streaming entire CDs or DVDs on Youtube for years and it seemed there's no problem whatsoever.
From what I understood, it would bring copyright strike from Youtube and following account suspension.
But am I missing something here?
How do they do it?
Any idea?
I am very curious about the way to get around a bunch of corporate lawyers.
Any input would be greatly appreciated.

The copyright owners don't go after every case so you end up with thousands of songs, albums, etc, especially older ones, good movies ,etc.

But if they do file a complaint, it's taken down, no ambiguity about that.

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Yep. It's a numbers game. They have the fingerprinting and it seems to get about 30-40% of copyrighted content but it doesn't get everything and even that can be defeated. If you get past the fingerprinting then they have to find it manually and issue the claim which results in one copyright strike. If someone has content over thousands of accounts and is doing it intelligently it's very hard for all those accounts to be taken down in a short period.

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